Membership of the single market and the customs union gives our country barrier-free, tariff-free access to the biggest single market in the world and, through the customs union, more trade deals with other countries across the world than any other leading economy outside those institutions. Why is the Prime Minister therefore determined to pull us out? Is it because she genuinely believes it is the right thing to do, which she did not just a matter of months ago, or is it because she has been taken hostage by the right wing of her party? Once more, another Conservative Prime Minister is not only putting her party political interests before the economic interests of our country but is putting at risk the integrity of the United Kingdom.